HP CP4525DN Laser CC494A#ABA manual Assembly Y/M on page 186 or

Problem Sample Cause Solution

Vertical white lines appear in a particular color.

The laser beam window is	Clean the window and remove any
dirty.	foreign substances.
Scratches are present on the	Remove the affected print cartridge
circumference of the	and re-install. The PGCs will clean
developing cylinder or	the glass.
photosensitive drum.	If the problem persists, replace the
White scratch down the page	affected print cartridge.
could mean the scanner glass
needs to be cleaned.
The laser/scanner-unit mirror	Replace the laser/scanner
is dirty.	assembly. See Laser/scanner
	assembly (Y/M) on page 186 or
	Laser/scanner assembly (C/Bk)
	on page 190.

Vertical white lines appear in all	Horizontal scratches on the	Replace the fuser. See Fuser
colors.	fuser roller.	on page 85.
	Scratches are present on the	Remove the affected print cartridge
	circumference of the ITB.	and re-install. The PGCs will clean
	White scratch down the page	the glass.
		Replace the ITB. See Intermediate
	could mean the scanner glass
	needs to be cleaned.	transfer belt (ITB) on page 92.
Horizontal lines appear on the	Repetitive horizontal lines	Use the repetitive defects ruler to
page.	appear.	identify the dirty roller. Clean the
		roller. If the roller cannot be cleaned,
		replace the fuser. See Fuser
		on page 85.
	Horizontal scratches are	Replace the print cartridge of the
	present on the photosensitive	color that matches the defect.
	drum.
	Horizontal scratches are	Replace the fuser. See Fuser
	present on the fuser roller.	on page 85.
A horizontal white line appears	Repetitive horizontal white	Use the repetitive defects ruler to
on the page.	lines appear.	identify the dirty roller. Clean the
		roller. If the roller cannot be cleaned,
		replace the roller.
	Horizontal scratches are	Replace the print cartridge of the
	present on the photosensitive	color that matches the defect.
	drum.
	Scratches are present on the	Replace the ITB. See Intermediate
	circumference of the ITB.	transfer belt (ITB) on page 92.

412 Chapter 3 Solve problems ENWW